Liquidus Line

Definition - What does Liquidus Line mean?

A liquidus line (or lines) is defined as the line on a phase diagram that delineates the liquid region of a material or substance. Above the liquidus line, the substance is considered to be completely liquid. In technical terms, the liquidus line represents the locus of temperatures above which the substance exhibits the behavior of a stable liquid.

The liquidus line is an essential parameter in metallurgy. Knowledge of a metal or alloy’s liquidus temperature can help researchers predict various physical and mechanical properties of the material.

Corrosionpedia explains Liquidus Line

The liquidus line is in direct contrast to the solidus line, which defines the region below which the substance is completely solid. On phase diagrams, there may be a gap between the solidus and liquidus line. In this region the substance may contain a mixture of liquids and crystals, similar to a slurry.